<template>
<div>
  <!--面包屑导航区-->
  <el-breadcrumb separator="/">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
  </el-breadcrumb>
  <!--卡片视图区域-->
  <el-card>
<!--    添加角色按钮区域-->
    <el-row>
      <el-col>
        <el-button type="primary">添加角色</el-button>
      </el-col>
    </el-row>
    <!--  角色列表区-->
    <el-table :data="rolelist" border stripe>
<!--      展开列-->
      <el-table-column type="expand">
        <!--eslint-disable-next-line-->
        <template slot-scope="scope">
          <el-row
            :class="['bdbottom',
            i1 === 0 ? 'bdtop' : '']"
            v-for="(item1, i1) in scope.row.children"
            :key="item1.id"
            class="vcenter"
          >
<!--            渲染一级权限-->
            <el-col :span="5">
              <el-tag
                closable
                @close="removeRightById(scope.row, item1.id)"
              >{{item1.authName}}</el-tag>
              <i class="el-icon-caret-right"></i>
            </el-col>
<!--            渲染二级和三级权限-->
            <el-col :span="19">
<!--              通过 for 循环 嵌套渲染二级权限-->
              <el-row
                :class="[i2 === 0 ? '' : 'bdtop']"
                v-for="(item2, i2) in item1.children"
                :key="item2.id"
                class="vcenter"
              >
                <el-col :span="6">
                  <el-tag
                    type="success"
                    closable
                    @close="removeRightById(scope.row, item2.id)"
                  >{{item2.authName}}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <el-col :span="18">
                      <el-tag
                        type="warning"
                        v-for="(item3) in item2.children"
                        :key="item3.id"
                        closable
                        @close="removeRightById(scope.row, item3.id)"
                      >{{item3.authName}}</el-tag>
                </el-col>
              </el-row>
            </el-col>
          </el-row>
        </template>
      </el-table-column>
<!--      索引列-->
      <el-table-column type="index"></el-table-column>
      <el-table-column label="角色名称" prop="roleName"></el-table-column>
      <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
      <el-table-column label="操作" width="300px">
        <!--eslint-disable-next-line-->
        <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
        </template>
      </el-table-column>
    </el-table>
  </el-card>
<!--  分配权限的对话框-->
  <el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="50%"
    @close="setRightDialogClosed"
  >
<!--    树形控件-->
    <el-tree
      :data="rightslist"
      :props="treeProps"
      show-checkbox
      node-key="id"
      default-expand-all
      :default-checked-keys="defKeys"
      ref="treeRef"
    ></el-tree>
    <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
  </el-dialog>
</div>

</template>

<script>
export default {
  data () {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      rightslist: [],
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: []
    }
  },
  created () {
    this.getRolelist()
  },
  methods: {
    // 获取所有角色的列表
    async getRolelist () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据id删除对应的数据
    async removeRightById (role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      this.$message.success('删除权限成功')
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // 获取到的权限数据，保存到data中
      this.rightslist = res.data
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式获取角色下所有三级权限的id，并保存到defKeys数组中
    getLeafKeys (node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolelist()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
